DHCP is short for Dynamic Host Configuration Protocol. Most of house computers access the internet as DHCP clients. For example, as Max starts his house computer, as a DHCP client, it sends request to DHCP server (owned by ISP) and get a response with a dynamical configuration information of network:
- IP Address
- Subnet Mask
- Default Gateway
- DNS server
- ...
The most important is IP address. DHCP client will never get a static IP for a long term. For example, T-online (ISP) automatically recycles all the IPs and assigns a new IP to your computer (DHCP client) in 24 hours. Actually, all the DHCP server has somehow been configured that client IP will be reassigned within a certain time span and IP ranges. What is DHCP good for? Because static IP is valuable resource of www, while DHCP is enable to more efficiently reuse the IP resource.
Just have a fun. If some marketing people of ISP keep bothering you with some blabla.., just ask him this question:
"Could you provide me a static IP with this price?"He will shut up immediately. Trust me.
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